【名词&注释】
冷却水(cooling water)、极限值、活塞环(piston ring)、说明书(specification)、活塞式(piston)、可利用(can use)、增压器转子(blower rotor)
[单选题]现代柴油机的余热情况有较大变化()。Ⅰ.废气的能量质量下降,可利用(can use)回收的能量减少;Ⅱ.空气冷却器冷却水带走的能量质量和数量增加
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ或Ⅱ对
D. Ⅰ+Ⅱ
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学习资料:
[单选题]对筒状活塞式柴油机,在未装活塞环的条件下,活塞位于近上、下止点位置时,活塞裙部与气缸内孔单边最小间隙应不小于()。
A. 该处总间隙的20%
B. 该处总间隙的25%
C. 说明书规定极限值的20%
D. 说明书规定极限值的25%
[单选题]拆下来的增压器转子(blower rotor)一般应该(),以防止()。
A. 立放/受力不均
B. 平放/受力不均
C. 平放/变形
D. 立放/变形
[单选题]Bearing knocks are likely to occur from ().
A. less clearance
B. dirty lube oil
C. overload
D. bearing wear
[单选题]Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the () and a recirculation system lubricating the running gear and cooling the piston.
A. cylinder liners and piston rings
B. main bearings
C. crankpin bearings
D. turboblower
[单选题]The crankshaft of diesel engine is supported by ().
A. tension stretch
B. tie rods
C. through bolts
D. main bearing
[单选题]The main factor which determines the output of each cylinder is ()
A. the cylinder weight
B. the cylinder bore
C. the cylinder length
D. the cylinder cover
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